Improvement in boring-machines



G. W.KMcCREVADY. Boring-Machines.

Patented feb. 1o. 18.74.-

ENTUB ely TTBNEYS.

wlusssss UNITED STATES PATENT OFFICE.

GEORGE lV. MCCREADY, OF PETITCODIAG, CANADA.

IMPROVEMENT IN BORING-MACHINES,

Specification forming part of Letters Patent No. 147,339, dated Februaryl0, 1874; application tiled November 15, 1873.

To all whom it may concern.-

Beit known that I, GEORGE W. MCGREADY, of lletitcodiac, in the Provinceof New Brunswick and Dominion of Canada, have invented a new andImproved Boring-lli'lachine, of which the following is a specification:

The object of my invention `is to provide an improved boring-machine,which is to be used in the manufacture of brushes, or for making theinternal mechanisms of musical instruments, orfor drilling holes into anumber of articles made of iron or other metals, or for such otherpurposes where a number of holes are required to be-bored at fixedintervals. The holes may thereby be bored simultaneously, rapidly, andevenly, economizing time and labor, and producing` superior work.

The invention will first be fully described, and then pointed out in theclaim.

In the accompanying drawing, Figure l represents a vertical longitudinalsection of my improved boring-machine on the line c c, Fig. 2 5 and Fig.2 shows a plan view ofthe SllllG. Y

Similar letters of reference indicate corresponding parts.

A represents the supportingtable and framework, to which the differentparts of the boring-machine are attached. B is the drivingplate, towhich motion is imparted by two cranks or eceentrics, B', which revolvewith the saine velocity, by means of two pinions, a', which are placedon the eccentric shafts b, and gear with the driving-wheel d, the shaftof which is connected to any suitable motive power. Shafts I) turn inbearings of frame A, and in vertical standards c, which also guide, bytheir horizontal base-parts, the borer-case C. Case C is secured totable A by a bindingscrew, f, turning on a screw-bolt, f', of thebottom-plate of the same, which bolt extends through a slot, g, of thetable A, so that the case may be brought within proper distance from thedriving-plate, while lateral motion is prevented by the standards e.Three borerplates, D, are perforated according to the pattern of thebrush or other article to be bored, and two of them placed into case-C,through which the front parts of the borers E are in- The third plate Dis then placed serted.

l upon the heads of borers E, case O and socketplate D being then placedin positionone on the table, the other into the central recess of thedriving-plate B, to which it is firmly attached. The borers E are madewith any one of the approved bits in common use, each being provided atits rear parts with a collar, h, andan oblique crank, t'. The collars hhold the borers E in position on the second borerplate D, during use,while the oblique cranks turn the borers. The pmel position of thecranks while turning prevents their interfering with eachother, nomatter how many be used or how closely they4 are arranged together. Therm support given by plates D to the borers E allows them to overcome thestrain to which they are exposed during their work.

As the borers rotate without advancing, it is necessary to feed thearticles against them by mechanical. power. For this purpose I employ afeeding apparatus, into which the articles are readily placed andremoved, while they are at the same time firmly clamped to prevent theirsplitting during the boring operation. 4

The feeding apparatus constitutes an essential part of my invention, andconsists of a sliding-carriage vise, F, operated by a lever, G, andtreadle connection. Carriage F slides between guide-rails l, which arescrewed to table A. The downward-projecting extensions l of guides lcarry the cross-bolt m, to which lever G is pivoted. The upper end oflever G is provided with a cross-bar, n, which slides in slots n ofcarriage F, producing thereby the forward and return motion of thecarriage. Cross barn connects also with pendent links o of the topclamping-plate p of carriage G, which is adjustably attached by screws pto the lateral front piece of the carriage, while its rear part is actedupon by a strong spiral spring, S, and slides on guidepins q. Theobjects to be bored are placed in the front parts of carriage F,clamped. with a vice-like grip by top plate p, and fed simultaneouslyforward against the lbits on releasing lever Gr.

By arranging the perforated plates'to correspond with any requiredpattern, a great i: mman variety of applications of the machine may beobtained, while any nuinber of borers lnay be employed, as theirconnection with the driving-plate by their parallel cranks prevents anyinterference of the saine.

The boring` or drilling of a series of holes into any article ofmanufacture is, by this inachine, greatly facilitated and rapidly andevenly accomplished.

Haying` thus described 1n y invention, I claim as new and desire tosecure by Letters Patent- The combination, with sliding carriage F,clai'np-platey, screws 19', and spring S, of the lever G, used inconnection with slots n and links o, as and for the purpose described.

GEORGE lV. MCCREADY. Witnesses BROUGHAM H. FREEZE, JOHN LEWIs.

